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[AZ-Observing] Re: Image Question
- From: "Tom Polakis" <tpolakis@xxxxxxx>
- To: "Reply-To:az-observing"@freelists.org
- Date: Fri, 05 Sep 2003 09:16:19 -0600
Bill Wood wrote:
> The new Tak mirrors are coated with real high tech stuff that lasts a
long time but none of the Tak dealers suggest that they will last as long
as 25 years without recoating.
Is this true even here in Aridzona? Other than a lot of dust, what
attacks coatings in this climate? Shouldn't mirror coating last for
decades in the desert, or am I misinformed again?
In the misinformed department, I will ask if it's not "technology"
(Austin Powers quotes added for effect) that is improving mirrors today,
what is it then? I defy you to find a good mirror greater than 16 inches
in diameter and faster than f/5 made before 1980 that was available
commercially for a reasonable price. Today, the shopper has many
options. What were an amateur astronomer's options 20 years ago?
Tom
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